This research conducted a Buddhist personality education program called Cultivating a happy mind in Buddha’s arms from April 28 to May 26, targeting nine boys in their age 4 to 5, who participated in the 2015 Jogyesa Temple young monk project, along with the case analyses. The program consists of the following process. First, young monks were encouraged to become aware and meditate as a daily routine. Second, Buddhist monks and experts in early childhood education integrated Buddhism with early childhood education by mutually complementing each other. Third, developmentally appropriate Buddhistic events were conducted, considering children’s developmental characteristics. The project resulted in a number of findings: first, practicing an understanding and merciful heart helped children to cultivate Buddhistic mind, correcting their basic life habits and characters. Second, integrative nature-friendly activities gave children the pleasure of laborious works, making them understand the preciousness of life. Third, they learned to eat gratefully, once again, recognizing the preciousness of all life. Fourth, their enterings to the Buddhist priesthood gave their parents self-growth time to grow in the Buddhist faith and positive mind. Fifth, it caused young monks to propagate Buddhism to the public. Lastly, children continued to have Buddhistic minds, even after they returned home, showing positive changes in their socio-emotional behavior.